How it works
You give us three things. We turn them into the one number that actually decides whether solar is worth it: the year it pays for itself.
Your ZIP tells us two things that swing the answer more than anything an installer will emphasise: how much sun your roof gets (NREL's solar-resource data for your state) and what you pay for grid electricity today (the EIA average residential rate for your state). A great payback in Arizona is a slow one in Washington, and the honest report says so.
Your bill tells us how much electricity you actually use, which sets the system size worth installing. There is no point paying for panels that make more power than you use in a state that pays you little for the surplus, and the report is sized with that in mind.
Great, average, or partly shaded. A south-facing, unshaded roof produces more than a shaded or awkwardly-angled one, and the estimate adjusts for it.
A PDF, in seconds: the system size worth installing, the cost before and after the 30% federal tax credit and any state incentive, your first-year savings, the payback year, and a year-by-year break-even out to 25 years. It's built to be read in five minutes and taken straight to any installer quote.
We never call you, never pass your details to installers, and never sell your number. The $15 is the whole business model.
